snub disphenoid

I've been looking around for turbos, since apparently the D&R AF61R is never going to appear. I'm looking at spending no more than $1200, and I've been considering either a Garrett T04R, Turbonetics 62-1, or lately I've been looking at a non-BB T-76. There's a few on Ebay for ~$1200 shipped, but I don't know if it would be very suitable for a 2-rotor application. Only specs on the one I'm looking at is the standard bearing, big shaft, Q-trim .96 undivided hotside.

I have a large streetport on a 9.0:1 compression S5 TII engine. Current fuel system is a Nippondenso Supra pump, 1000cc/1600cc injectors and stock fuel lines. Has anyone run this size turbo on a 2-rotor engine? I would like full boost from 5000RPM, and over 400hp on 91 octane. I'm upgrading my fuel/ignition before October, when I'll run C16, but for now I'm shooting for ~15psi on pump gas, maybe 420hp?

ProjectD

iTrader: (15)

I'll let you know how my T04R does on my Streetported motor if i'm able to get in on the dyno tomorrow. I'm running stock primaries same fuel pump and also on 91 octane.

Cyan

old_skool

my buddy has a T78 on his FD. once it gets boosting, this thing is insane! look him up. his name on the forums is I8URV8. hes not on often though...

PDViper77

iTrader: (9)

I have almost the same fuel setup (2 FPs and braided SS Fuel line) and I hit 450 whp at 17psi on pump 93. You are going to need a bigger FP or two of the nippondensos. Then 400 whp should be no problem.

willjs7

iTrader: (1)

i belive the post is reffering to the turbonetics T-76, which is a very large frame T4 turbo, as opposed to a greddy t78 which you speak of, which is a much smaller turbo.

snub disphenoid

Yes, I am talking about the Turbonetics T-76 large frame turbo.

PDViper, are you saying I'm going to need to rework the fuel system (i.e. twin nippondensos w/ a parallel fuel rail setup) to safely run 400rwhp? I thought the Supra pump could flow enough through the stock lines for ~450rwhp...

I mean I need to do it sooner or later, if I need to do it now it would be nice to know.

peachykeenwight

A Turbonetics 62-1 will get the job done if you're looking for those numbers.. our cars are surprisingly alike judging from your sig description.

snub disphenoid

Well 400hp+ is the goal on pump gas. The motor is being built so it can handle higher boost, so there would probably be a big difference between a 62-1 and a T76, T04R or GT4088 at 25psi. To be completely honest I'd like to see over 500, perhaps as much as 600, and 62-1's, as nice as they are, won't get me there as easily.

peachykeenwight

Oh, I thought 400 was the goal period. Now I see why you're talking T76.

What is the car set up for? Drag, road racing?

snub disphenoid

The car will be used for a little bit of everything. I'm not going with a drag suspension setup, I'm just throwing some drag radials on the rears and taking it to the strip once it's tuned. However, I would like to have a powerband that's somewhat useable for road racing. I'm not planning on being competitive or anything, just looking to have some fun. It currently has full suspension work (for a street car) and a 6-pt. rollbar, so it's not exactly set up for straight-line racing.

I remembered that V8KILA used a PT-76 GTS turbo to make 650+rwhp, but I believe that was a BB turbo, and even then it took until ~4800rpm to see full boost, 5000rpm to get well into the powerband. That seems a little too peaky to me, as my motor probably won't make power through 9000rpm. I think I might just curb my enthusiasm and go with a T04R.

Zero R

iTrader: (1)

TO4R compressor will support about 74-76lbsmin. good for low/mid 500's if all is done up to that level. That would require high boost and all that comes with it to get that level though. I have them here should you decide that is the way you want to go.

razorback

isnt the af61r a tractor turbo, or am i mistaken?

GoodfellaFD3S

iTrader: (213)

I think that's a good idea. In my opinion the T-76 is too large for a 2 rotor street car.

darkphantom

iTrader: (2)

t76 is an easily 600hp car. crisspeed would know alot more about that turbo as he got around 680 @ 31-34lbs on a street ported motor. but its a fairly large turbo (5000rpm spoolage)

snub disphenoid

I remember that video, it was an even quicker spooling turbo than the one I was looking at, a PT-76 GTS, which I believe is ball-bearing. Granted he probably had a larger hotside, but still, I think a non-BB T-76 gives me a fairly useless powerband.

500rwhp will be enough to "put my bowels in my back pocket," especially if I get my car a little lighter. Plus, most people with T04Rs are seeing 15psi around 3800-4200rpm, which gives me about 4500rpm of good powerband, as opposed to like 3000. What should I get to take advantage of the 76lbs./min the T04R can push out? I was thinking something along the lines of:

Dual ND fuel pump w/ parallel fuel rails
I already have an MSD box, dunno if I need more than that
FD/Cosmo/Jaytech intake manifold setup
big, efficient intercooler
4"->dual 3" mandrel bent exhaust
Water/alky injection(17psi on pump gas=hp???)

I think over 500rwhp would make for one hell of an FC. 600 would only be something I could only talk about, not practically or reliably produce/use.

olyrx7

iTrader: (3)

If you want real big power go with a gt42r or a Greddy T-88. I get full boost with my greddy T-88 at around 4700rpm, I am very pleased. Honestly, both these turbos can push around 50psi, you will never reach that number.

The other question is whether you want a ball bearing or not. Everyone has their opinion, I prefer non-ball bearing. Seeing that you want to both drag and road course your car, then I think a gt35r would be a good choice. It's a turbo that is great for road courses and when pushed really hard capable of running 10's.

darkphantom

iTrader: (2)

you cant rebuild a ball bearing, and those extra 300rpm spool over a non ballbearing isnt really a big difference

bobybeach

a true 62-1 has more than enough compressor flow to get you over 500whp. just match it with a gd size turbine housing like p or q trim 1.15ar and you will be there.

I have a customer that has made 500whp with a smaller compressor.

A t-76 is way to big. dont do it. it will make for a big laggy pig that will never see the boost required to out flow a smaller turbo of half its size.

If you want to play it safe then a t-66 (to4r) will be the one.

snub disphenoid

Well, I was a bit anxious to get back to building this car up when I got back from Japan, so I was having delusions about my goals with the car. I forgot that I was going to track it for fun and that a big laggy monster is no fun in the mountains. I have a (I think) T04B V-Trim, 1.15 A/R turbine, which has made over 350rwhp on pump gas on other cars, so I think that coupled with the fact that it can provide boost fairly low (~3000rpm it starts to spool) it will work fine for me.

If I really want to go crazy I'll start putting money away for the crapload of work it would be to get 500hp.

bobybeach

yea those v trim to4b work great. i had one of these matched with a .84ar housing. It was the bee's nee's.